<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<input type="button" value="按钮" onclick="f1()">
<script>
   /*第一种声明方法方式*/
    //无参无返回值
        function f1(){
            console.log("f1")
        }
        f1();

        //有参无返回值
        function f2(name ,age) {
            console.log(name+":"+age)
        }
        f2("六国斌",50)

        //无参有返回值
        function f3() {
            return "热血";
        }
        let info = f3();
        console.log(info)

        //有参有返回值
        function f4(x,y){
            return x*y;
        }
        let result = f4(8,9);
        console.log(result)

    /*第二种声明方法方式*/
        let f5 = function (name,age) {
            console.log(name+":"+age)
        }
        f5("吊毛",18);

    /*第三种声明方法方式*/
        let f6 =new   Function("name","age","console.log(name+':'+age)");
        f6("吕布",66)
</script>
</body>
</html>